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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1, Number 3, May 2009

Issue on Electrical & Electronics

Page(s): 52-56

Accelerated Insulation Aging in Thyristor Controlled Single Phase Induction Motors

T.G.Arora, M.V.Aware, D.R.Tutakn

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Thyristor based, phase angle controlled, speed regulators are widely used for energy efficient control of single-phase induction motors. This leads to power saving but adversely affects the life of insulation in the motors due to distortions in the applied voltage and current waveforms. The accelerated insulation ageing is due to increased voltage peaks, voltage transients, sharp dV/dt and increased thermal stress. Voltage harmonics increase dielectric and core losses. Current peaks increase the overall heating of the winding hence cause thermal stress in the insulation. This paper presents the effect of non-sinusoidal voltage and current waveforms on the insulation of single-phase induction motors. A comparison between power electronic phase angle controlled regulator and conventional resistive regulator is presented by experimental results. The results compare quantitatively the insulation stress parameters due to non-sinusoidal & sinusoidal voltage and current on motor. The results can be used to estimate the accelerated insulation ageing due to phase angle controlled speed regulators in single-phase induction motors.

Index Terms

Dielectric power loss, Distortion factor (DF), Peak modification factor (Kp), Peak current (Ip), Rate of rise of voltage (dV/dt) and Voltage transients, Wave shape modification factor (Ks)

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